Research Grant Programs

Research Projects (R)

The R-series includes the most common research grant programs such as NIH's main independent research project grants (R01), small grants (R03), research enhancement awards (REA, R15), exploratory and developmental research projects (R21), clinical trial planning grants (R34), high priority short-term projects (R56), and more.

Multiproject (P, U)

Single grant that funds at least two related research projects collaborating for a common goal. Multiproject applications may be investigator-initiated or may respond to a solicited funding opportunity announcement. 

Popular Research Project Grants: R01, R03, or R21

This page discusses the NIH standard independent R01 grant as well as the potential benefits and drawbacks of the small grant (R03) and exploratory/developmental research grant (R21).

Content last reviewed on